Resettable cluster type sliding sleeve for horizontal well fracturing

Abstract

The utility model discloses a resettable cluster type sliding sleeve for horizontal well fracturing, which relates to the technical field of cluster type fracturing sliding sleeves, and comprises an upper pipe sleeve, the bottom of the upper pipe sleeve is in threaded connection with a stamping pipe, a sliding sleeve inner pipe is sleeved in the stamping pipe, the bottom of the stamping pipe is in threaded connection with a lower pipe sleeve, and the lower pipe sleeve is sleeved with a sliding sleeve outer pipe. A reset assembly is arranged on the inner wall of the upper pipe sleeve, a second telescopic rod is arranged in a reset tension spring in a sleeved mode through the reset assembly, an upper reset fixing plate is fixed to the top end of the reset tension spring and the top end of the second telescopic rod, and the upper reset fixing plate is fixed to the inner wall of the upper pipe sleeve. When a soluble ball is put in, the soluble ball downwards presses an inner pipe of the sliding sleeve to enable the reset tension spring to be stretched, high-pressure fluid is injected at the moment, the high-pressure fluid is sprayed out through fracturing spray holes to conduct fracturing operation on the periphery of the stamping pipe, then the soluble ball is dissolved, the reset tension spring contracts, and then the soluble ball and the reset tension spring are separated from each other. And the sliding sleeve inner pipe is driven to move upwards to reset.

Description

Technical Field

[0001] The utility model relates to the technical field of movable board houses, in particular to a resettable cluster sliding sleeve used for horizontal well fracturing. Background Art

[0002] In oil and gas production, the cracks produced by horizontal well fracturing are related to the direction of the horizontal wellbore axis. In horizontal well fracturing, if the wellbore and the maximum stress direction are the same, longitudinal cracks perpendicular to the minimum stress direction will be formed. If the wellbore and the maximum principal stress direction are perpendicular, transverse cracks extending in the maximum principal stress direction will be formed. In oil and gas production, before horizontal well fracturing, oil and gas usually gather around the well wall with a radial flow trend, and the seepage resistance is relatively large. After horizontal well fracturing, the flow direction will be parallel to the crack surface, and the resistance will be relatively reduced, which can better exploit oil and gas resources. At present, the inner tube of the horizontal well fracturing sleeve cannot be reset after ball fracturing.

[0003] The existing patent (publication number: CN215213444U) proposes a resettable cluster sleeve for horizontal well fracturing, including a main body mechanism and a fracturing mechanism. The main body mechanism is internally connected with a fixing mechanism, and the fracturing mechanism is connected to the internal upper end of the main body mechanism. The fracturing mechanism includes a telescopic rod and a slider. The inner left side of the slider is connected with a fixing rod, the top surface of the fixing rod is connected to a limiting block, and the slider is connected to the top surface of the telescopic rod. The cluster fracturing sleeve for horizontal well fracturing moves downward through a frame, and the frame drives the slider to move, and the slider moves on the fixed rod. At the same time, the slider moves downward, the slider begins to compress the telescopic rod, and the frame moves on the rolling device, thereby reducing friction, reducing the wear of the device and increasing the service life of the device.

[0004] The cluster fracturing sleeve for horizontal well fracturing adopts a technical solution to reduce friction. The frame moves downward, and the frame drives the slider to move. The slider moves on the fixed rod. At the same time, the slider moves downward, the slider begins to compress the telescopic rod, and the frame moves on the rolling device to reduce friction. The problem with the above solution is that after the frame moves downward, that is, when the fracturing operation is completed, the frame cannot be reset. Therefore, we propose a resettable cluster sleeve for horizontal well fracturing to solve the above problem. Utility Model Content

[0005] The utility model provides a resettable cluster-type sliding sleeve for horizontal well fracturing, which solves the technical problem that the current cluster-type fracturing sliding sleeve for horizontal well fracturing cannot be automatically reset after moving.

[0006] In order to solve the above technical problems, the utility model provides a resettable cluster sliding sleeve for horizontal well fracturing, comprising an upper sleeve, the bottom of the upper sleeve is threadedly connected with a punching pipe, the inner sleeve of the punching pipe is provided with a sliding sleeve inner pipe, the bottom of the punching pipe is threadedly connected with a lower sleeve, the inner wall of the upper sleeve is provided with a reset component, the top end of the reset component is fixed to the inner wall of the upper sleeve, and the bottom end of the reset component is fixed to the top of the sliding sleeve inner pipe;

[0007] The reset assembly includes a reset tension spring, a second telescopic rod is sleeved inside the reset tension spring, an upper reset fixing plate is fixed to the top of the reset tension spring and the second telescopic rod, the upper reset fixing plate is fixed to the inner wall of the upper pipe sleeve, a lower reset fixing plate is fixed to the bottom ends of the reset tension spring and the upper reset fixing plate, and the lower reset fixing plate is fixed to the top of the inner tube of the sliding sleeve.

[0008] Preferably, a fracturing spray hole is opened on the stamping tube, an upper threaded connecting tube is fixed on the top of the stamping tube, a lower threaded connecting tube is fixed on the bottom of the stamping tube, a wheel groove is opened on the inner wall of the stamping tube, an upper threaded tube is fixed on the bottom of the upper pipe sleeve, and the upper threaded tube is threadedly connected to the upper connecting tube.

[0009] The above technical solution is adopted: a fracturing spray hole is opened on the stamping pipe, and high-pressure fluid passes through the fracturing spray hole to perform spray fracturing on the place where fracturing is required. An upper threaded connecting pipe is fixed on the top of the stamping pipe, and a lower threaded connecting pipe is fixed on the bottom of the stamping pipe. A wheel groove is opened on the inner wall of the stamping pipe, and an upper threaded pipe is fixed on the bottom of the upper pipe sleeve. The upper threaded pipe is threadedly connected to the upper connecting pipe, and the threaded connection is convenient for disassembly.

[0010] Preferably, rollers are fixed on both sides of the inner tube of the sliding sleeve, and the rollers are arranged in wheel grooves. A ball blocking ring is fixed on the bottom of the inner tube of the sliding sleeve, and a soluble ball is arranged in the ball blocking ring.

[0011] The above technical solution is adopted: rollers are fixed on both sides of the inner tube of the sliding sleeve, and the rollers are arranged in the wheel grooves. Through the rotation of the rollers, the friction between the inner tube of the sliding sleeve and the punching tube is reduced when the inner tube of the sliding sleeve moves downward. A spherical blocking ring is fixed to the bottom of the inner tube of the sliding sleeve, and a soluble ball is arranged in the spherical blocking ring. The soluble ball is put in to press the inner tube of the sliding sleeve downward, so that the high-pressure fluid is ejected from the fracturing nozzle hole to complete the fracturing operation.

[0012] Preferably, a buffer assembly is provided on the inner wall of the lower pipe sleeve, and the buffer assembly includes a buffer spring, a first telescopic rod is provided inside the buffer spring, an upper buffer fixing plate is fixed to the top end of the buffer spring and the first telescopic rod, and a lower buffer fixing plate is fixed to the bottom end of the upper buffer fixing plate.

[0013] The above technical solution is adopted: a buffer assembly is arranged through the inner wall of the lower pipe sleeve, the buffer assembly includes a buffer spring, a first telescopic rod is arranged inside the buffer spring, an upper buffer fixing plate is fixed to the top end of the buffer spring and the first telescopic rod, and a lower buffer fixing plate is fixed to the bottom end of the upper buffer fixing plate. When the soluble ball is dropped and presses the inner tube of the sliding sleeve downward, the buffer spring can play a buffering role to prevent the soluble ball from pressing the inner tube of the sliding sleeve to completely detach from the stamping tube under the action of its own gravity.

[0014] Preferably, the upper buffer fixing plate is fixed to the bottom end of the spherical blocking ring, and the lower buffer fixing plate is fixed to the inner wall of the lower pipe sleeve.

[0015] The above technical solution is adopted: the upper buffer fixing plate is fixed to the bottom end of the ball blocking ring, and the lower buffer fixing plate is fixed to the inner wall of the lower pipe sleeve. When the soluble ball presses down the ball blocking ring, the upper buffer plate is fixed to the bottom end of the ball blocking ring, and the ball blocking ring can drive the inner tube of the sliding sleeve to move downward.

[0016] Preferably, a lower threaded tube is fixed to the top of the lower pipe sleeve, the lower threaded tube is threadedly connected to the lower connecting tube, and the diameter of the inner tube of the sliding sleeve is smaller than the diameters of the upper pipe sleeve, the upper threaded tube, the lower pipe sleeve and the lower threaded tube.

[0017] The above technical solution is adopted: a lower threaded tube is fixed through the top of the lower pipe sleeve, the lower threaded tube is threadedly connected to the lower connecting tube, and the diameter of the inner tube of the sliding sleeve is smaller than the diameters of the upper pipe sleeve, the upper threaded tube, the lower pipe sleeve and the lower threaded tube, so as to ensure that the inner tube of the sliding sleeve can move in the lower pipe sleeve and the lower threaded tube.

[0018] Compared with the related art, the utility model has the following beneficial effects:

[0019] 1. Compared with the traditional cluster fracturing sleeve of horizontal well fracturing, the utility model is provided with a reset component, the inner sleeve of the reset tension spring is provided with a second telescopic rod, the top of the reset tension spring and the second telescopic rod is fixed with an upper reset fixing plate, the upper reset fixing plate is fixed to the inner wall of the upper pipe sleeve, the bottom ends of the reset tension spring and the upper reset fixing plate are fixed with a lower reset fixing plate, and the lower reset fixing plate is fixed to the top of the inner tube of the sleeve. When the soluble ball is put in, the soluble ball presses the inner tube of the sleeve downward to stretch the reset tension spring. At this moment, high-pressure fluid is injected and sprayed out through the fracturing nozzle hole to perform fracturing operations around the punching pipe. After that, the soluble ball dissolves, the reset tension spring contracts, and drives the inner tube of the sleeve to move upward and reset.

[0020] 2. In the utility model, rollers are fixed on both sides of the inner tube of the sliding sleeve, and the rollers are arranged in the wheel grooves. The rollers rotate to reduce the friction between the inner tube of the sliding sleeve and the stamping tube when the inner tube of the sliding sleeve moves downward, thereby further improving the service life of the inner tube of the sliding sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of a resettable cluster sliding sleeve used for horizontal well fracturing;

[0022] Figure 2 The schematic diagram of the cross-section structure of a resettable cluster sliding sleeve used for horizontal well fracturing is shown;

[0023] Figure 3 The schematic diagram of the dissection of a cluster sliding sleeve that can be reset for horizontal well fracturing is shown;

[0024] Figure 4 The present invention is a disassembled diagram of the reset component and the buffer component in the cross section of a cluster sliding sleeve that can be reset for horizontal well fracturing.

[0025] Numbers in the figure: 1. upper sleeve; 101. upper threaded pipe; 2. lower sleeve; 201. lower threaded pipe; 3. stamping pipe; 301. fracturing nozzle; 302. wheel groove; 303. upper connecting pipe; 304. lower connecting pipe; 4. inner tube of sliding sleeve; 401. roller; 5. ball blocking ring; 6. buffer assembly; 601. buffer spring; 602. upper buffer fixing plate; 603. first telescopic rod; 604. lower buffer fixing plate; 7. reset assembly; 701. reset tension spring; 702. upper reset fixing plate; 703. second telescopic rod; 704. lower reset fixing plate; 8. soluble ball. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] Embodiment 1

[0028] like Figure 1-Figure 4 As shown, a cluster sliding sleeve for horizontal well fracturing that can be reset includes an upper sleeve 1, a punching pipe 3 is threadedly connected to the bottom of the upper sleeve 1, a sliding sleeve inner pipe 4 is sleeved inside the punching pipe 3, a lower sleeve 2 is threadedly connected to the bottom of the punching pipe 3, a reset component 7 is arranged on the inner wall of the upper sleeve 1, the top end of the reset component 7 is fixed to the inner wall of the upper sleeve 1, and the bottom end of the reset component 7 is fixed to the top of the sliding sleeve inner pipe 4;

[0029] The reset assembly 7 includes a reset tension spring 701, a second telescopic rod 703 is sleeved inside the reset tension spring 701, an upper reset fixing plate 702 is fixed to the top of the reset tension spring 701 and the second telescopic rod 703, the upper reset fixing plate 702 is fixed to the inner wall of the upper pipe sleeve 1, and a lower reset fixing plate 704 is fixed to the bottom of the reset tension spring 701 and the upper reset fixing plate 702, and the lower reset fixing plate 704 is fixed to the top of the inner pipe 4 of the sliding sleeve;

[0030] The bottom of the upper sleeve 1 is threadedly connected with a punching tube 3, and a sliding sleeve inner tube 4 is provided inside the punching tube 3. The bottom of the punching tube 3 is threadedly connected with a lower sleeve 2. A reset component 7 is provided on the inner wall of the upper sleeve 1. The top end of the reset component 7 is fixed to the inner wall of the upper sleeve 1, and the bottom end of the reset component 7 is fixed to the sliding sleeve inner tube 4, which is convenient for the sliding sleeve inner tube 4 to move downward and prevent the reset component 7 from falling off from the inner wall of the upper sleeve 1. The upper sleeve 1 is threadedly connected to the punching tube 3 for easy disassembly.

[0031] The reset assembly 7 includes a reset tension spring 701, and a second telescopic rod 703 is sleeved in the reset tension spring 701. An upper reset fixing plate 702 is fixed to the top of the reset tension spring 701 and the second telescopic rod 703. The upper reset fixing plate 702 is fixed to the inner wall of the upper pipe sleeve 1. A lower reset fixing plate 704 is fixed to the bottom ends of the reset tension spring 701 and the upper reset fixing plate 702. The lower reset fixing plate 704 is fixed to the top of the sliding sleeve inner tube 4. The sliding sleeve inner tube 4 moves downward to drive the reset tension spring 701 to stretch. When the fracturing operation is completed, the reset spring is in a contracted state and the sliding sleeve inner tube 4 is pulled back to its original position.

[0032] Embodiment 2

[0033] like Figure 1-Figure 4As shown, the stamping tube 3 is provided with a fracturing spray hole 301, an upper threaded connecting tube is fixed on the top of the stamping tube 3, a lower threaded connecting tube is fixed on the bottom of the stamping tube 3, a wheel groove 302 is provided on the inner wall of the stamping tube 3, an upper threaded tube 101 is fixed on the bottom of the upper pipe sleeve 1, the upper threaded tube 101 is threadedly connected with the upper connecting tube 303, rollers 401 are fixed on both sides of the sliding sleeve inner tube 4, the rollers 401 are arranged in the wheel groove 302, a ball blocking ring 5 is fixed on the bottom of the sliding sleeve inner tube 4, a soluble ball 8 is arranged in the ball blocking ring 5, and a buffer component 6 is provided on the inner wall of the lower pipe sleeve 2, and the buffer component 6 includes a buffer spring 601, a first telescopic rod 603 is sleeved in the buffer spring 601, an upper buffer fixing plate 602 is fixed to the top of the buffer spring 601 and the first telescopic rod 603, a lower buffer fixing plate 604 is fixed to the bottom of the upper buffer fixing plate 602, the upper buffer fixing plate 602 is fixed to the bottom end of the spherical blocking ring 5, the lower buffer fixing plate 604 is fixed to the inner wall of the lower pipe sleeve 2, a lower threaded tube 201 is fixed to the top of the lower pipe sleeve 2, the lower threaded tube 201 is threadedly connected to the lower connecting tube 304, and the diameter of the inner tube 4 of the sliding sleeve is smaller than the diameters of the upper pipe sleeve 1, the upper threaded tube 101, the lower pipe sleeve 2, and the lower threaded tube 201;

[0034] Rollers 401 are fixed on both sides of the sliding sleeve inner tube 4, and the rollers 401 are arranged in the wheel grooves 302. The rollers 401 rotate to reduce the friction between the sliding sleeve inner tube 4 and the punching tube 3 when the sliding sleeve inner tube 4 moves downward. A ball blocking ring 5 is fixed at the bottom of the sliding sleeve inner tube 4, and a soluble ball 8 is arranged in the ball blocking ring 5. The soluble ball 8 is put in to press the sliding sleeve inner tube 4 downward, so that the high-pressure fluid is sprayed out from the fracturing spray hole 301 to complete the fracturing operation.

[0035] The inner wall of the lower pipe sleeve 2 is provided with a buffer component 6, and the buffer component 6 includes a buffer spring 601, and a first telescopic rod 603 is sleeved inside the buffer spring 601. An upper buffer fixing plate 602 is fixed to the top of the buffer spring 601 and the first telescopic rod 603, and a lower buffer fixing plate 604 is fixed to the bottom of the upper buffer fixing plate 602. When the soluble ball 8 is dropped and presses the inner tube 4 of the sliding sleeve downward, the buffer spring 601 can play a buffering role to prevent the soluble ball 8 from pressing the inner tube 4 of the sliding sleeve to completely separate from the stamping tube 3 under the action of its own gravity.

[0036] Working principle: Figure 1-Figure 4As shown, a soluble ball 8 is dropped into the horizontal well, and the soluble ball 8 falls downward, pressing the spherical blocking ring 5 to move downward, and the spherical blocking ring 5 moves downward with the sliding sleeve inner tube 4, and the reset tension spring 701 in the reset assembly 7 is in a stretched state, and a high-pressure fluid is injected into the upper sleeve 1, and the high-pressure fluid is ejected outward through the fracturing spray hole 301 on the stamping pipe 3, thereby forming a fracturing around the stamping pipe 3. When the fracturing operation is completed, after the soluble ball 8 is dissolved, there is no gravity pressing down on the spherical blocking ring 5, so the sliding sleeve inner tube 4 fixed on the spherical blocking ring 5 is reset under the contraction of the reset tension spring 701, and the rollers 401 fixed on both sides of the sliding sleeve inner tube 4 move up and down in the wheel groove 302, which can reduce the friction between the sliding sleeve inner tube 4 and the stamping pipe 3, and further improve the service life of the sliding sleeve inner tube 4.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A resettable cluster sleeve for horizontal well fracturing, characterized in that: It comprises an upper pipe sleeve (1), the bottom of the upper pipe sleeve (1) is threadedly connected to a punching pipe (3), the punching pipe (3) is sleeved with a sliding sleeve inner pipe (4), the bottom of the punching pipe (3) is threadedly connected to a lower pipe sleeve (2), the inner wall of the upper pipe sleeve (1) is provided with a reset component (7), the top end of the reset component (7) is fixed to the inner wall of the upper pipe sleeve (1), and the bottom end of the reset component (7) is fixed to the top of the sliding sleeve inner pipe (4); The reset assembly (7) comprises a reset tension spring (701), a second telescopic rod (703) is sleeved inside the reset tension spring (701), an upper reset fixing plate (702) is fixed to the top ends of the reset tension spring (701) and the second telescopic rod (703), the upper reset fixing plate (702) is fixed to the inner wall of the upper pipe sleeve (1), and a lower reset fixing plate (704) is fixed to the bottom ends of the reset tension spring (701) and the upper reset fixing plate (702), and the lower reset fixing plate (704) is fixed to the top of the inner pipe (4) of the sliding sleeve.

2. The resettable cluster sliding sleeve for horizontal well fracturing according to claim 1, characterized in that: The punched pipe (3) is provided with a fracturing spray hole (301), an upper connecting pipe (303) is fixed to the top of the punched pipe (3), a lower connecting pipe (304) is fixed to the bottom of the punched pipe (3), a wheel groove (302) is provided on the inner wall of the punched pipe (3), an upper threaded pipe (101) is fixed to the bottom of the upper pipe sleeve (1), and the upper threaded pipe (101) is threadedly connected to the upper connecting pipe (303).

3. The resettable cluster sliding sleeve for horizontal well fracturing according to claim 1, characterized in that: Rollers (401) are fixed on both sides of the sliding sleeve inner tube (4), and the rollers (401) are arranged in the wheel grooves (302). A spherical ball blocking ring (5) is fixed on the bottom of the sliding sleeve inner tube (4), and a soluble ball (8) is arranged in the spherical ball blocking ring (5).

4. The resettable cluster sliding sleeve for horizontal well fracturing according to claim 1, characterized in that: The inner wall of the lower pipe sleeve (2) is provided with a buffer assembly (6), and the buffer assembly (6) comprises a buffer spring (601), and a first telescopic rod (603) is sleeved inside the buffer spring (601), and an upper buffer fixing plate (602) is fixed to the top end of the buffer spring (601) and the first telescopic rod (603), and a lower buffer fixing plate (604) is fixed to the bottom end of the upper buffer fixing plate (602).

5. The resettable cluster sliding sleeve for horizontal well fracturing according to claim 4, characterized in that: The upper buffer fixing plate (602) is fixed to the bottom end of the spherical blocking ring (5), and the lower buffer fixing plate (604) is fixed to the inner wall of the lower pipe sleeve (2).

6. The resettable cluster sliding sleeve for horizontal well fracturing according to claim 1, characterized in that: A lower threaded tube (201) is fixed to the top of the lower pipe sleeve (2), the lower threaded tube (201) is threadedly connected to the lower connecting tube (304), and the diameter of the sliding sleeve inner tube (4) is smaller than the diameters of the upper pipe sleeve (1), the upper threaded tube (101), the lower pipe sleeve (2), and the lower threaded tube (201).

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